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|  DSH 548
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| Application of IEC 60320-1 type appliance inlets6 f2 l$ P3 T7 r0 o( X" v* m
| 1.5.2, 4.5.1) y; H; T1 n9 q
| 60950(ed.3)
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Standard(s):( j- C$ ~6 }- @) i( g) D
IEC 60950:1999
# d: A, ~! _1 G3 G4 E0 i. B: ?Sub clause(s):: `6 [ ^! j% I9 y" ]
1.5.2, 4.5.13 ~. w" A. S0 g: f" s
Dec. NO.0 B- `8 B# W d2 o
DSH-548
, S8 W+ K' D7 I r( PSubject:
' ^: H( w, I4 a8 W. `* jApplication of IEC 60320-1 type' u% t) Z, `6 v' A+ w: `
appliance inlets0 m( O* y, {+ x; L: X' d
Key words:
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Decision taken at the 41st
2 f `, R5 W" d6 ?; b2 rCTL meeting., i2 \" Y: K9 u s
Question:/ L2 A9 K1 i7 |: T) c6 a7 ]
Background:
( Q# c; A; k) L8 MAn increasing number of Notebook PCs require AC Adaptors to provide output power of up to 150 W b: F- j0 u) F* w+ a4 O& n
at an ambient of up to 40 °C (due Pentium-4 devices). Although designed with a very good efficiency,6 w5 L# `6 ?& B# x, F
the losses still result in high operating temperatures.$ y5 S# d8 R. _/ R
Problem:6 f. r7 l+ k4 g6 G" B' T) `
IEC 60950:99 refers in several subclauses and in Annex P to IEC 60320 series as relevant IEC
) H( i* O8 U4 [component standard for appliance inlets. j. |3 X# L/ q: q7 `3 M& H
However, there aren't any specific temperature limits for appliance inlets specified in table 4A parts 1
, \& y! w( Z Hand 2.
5 K* d8 v9 @: t/ c+ BThis results in a non-uniform interpretation whether: O8 x6 H7 {4 ?* d" b
(a) the temperature limit of external surfaces of equipment which can be touched (95 °C5 z5 Y* [. p# x; ?) D2 s* k
for the plastic housing of the appliance inlet)
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. X& B) F2 |1 e% H" t(b) the temperature limit of IEC 60320-1 (70 °C for the pins of the appliance inlet for cold4 |: X ^; g, G
conditions)
$ D3 O: l) I$ W/ K; W! qshall be chosen for the assessment of the maximum temperature of the appliance inlet.0 R" ^% s+ D6 F/ g- R5 n
A clarification for following would be helpful:2 [- b* R3 ]4 w+ H
(i) Is (only) the maximum temperature of the appliance inlet housing to be measured?0 F( h4 T4 Z) A1 \3 o# H
OR5 A# a% H! Y! I: y% J6 H0 Y: q6 _
(ii) Is it necessary to measure besides the temperature of accessible surfaces as well
( n/ w) p! B5 {the maximum temperature of the pins of an appliance inlet (test location as required7 M1 Z/ `3 f/ K1 d/ T' z! C' B
according to IEC 60320-1)?1 j0 M( c. y+ ~+ ^% b
Decision:
1 a0 H& i- U! U0 {* y3 ^For testing of a product incorporating IEC 60320-1 type appliance inlets, the temperature limits and
, ^, p2 H0 A' a1 Ilocations for temperature measurements as described in IEC 60320-1 shall apply:: d7 M% t# S' f- D, b
• 70 °C maximum pin temperature for appliance inlet for cold conditions% Y5 p+ x1 D. v+ ^1 x+ H
• Test location: Base of the pin (part of the pin where it protrudes from the engagement face)
& Y% b( V$ }7 W. ?/ n }The temperature rise shall be determined at the maximum room ambient temperature as declared by+ W/ ~5 d2 q$ T g! A. ?7 R( \% R9 k
the AC Adaptor's manufacturer.
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